1526, "the doing of more than duty requires," in Catholic theology, from L.L.
supererogationem (nom.
supererogatio) "a payment in addition," from
supererogatus, pp. of
supererogare "pay or do additionally," from L.
super "above, over" (see
super-) +
erogare "pay out," from
ex- "out" +
rogare "ask, request" (see
rogation).